Are these workouts beneficial for people who aren’t sick? How? 

Yes, they are very beneficial for all people! In fact, studies are now showing that moderate intense workouts like these are more beneficial to your health long term, than high intense, stressful workouts. If you would like to learn more, see my video on YouTube about the benefits of moderate intense exercise, entitled, “Beware! Could This Dangerous Exercise Practice Be Increasing Your Belly Fat & Ruining Your Health!”